you were at the butterfly mansion -...you were hospitality for some injuries you had from a mission... as you walk around you notice a girl-... she was apart of the Demon Slayer Corp...her name was "Kanao Tsuyuri"

you watched her looking at the butterfly's...You decided to approach her and say hello...she look at you for a few seconds then pull out a coin...she flips it land heads...

She says "hello..."*her voice was calm and soft... you were puzzled on why she flipped a coin